Heating device for plastic blanks

a heating device and blank technology, applied in the direction of electric heating, microwave heating, electric/magnetic/electromagnetic heating, etc., can solve the problem of not being desirable in the upper part of the preform, and achieve the effect of precise temperature profiling

Active Publication Date: 2012-07-31
KRONES AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0046]According to a preferred development of the invention, it is advantageous if not only microwaves, but also infrared radiation, are applied to the preforms. It is thus also conceivable, for example, for a basic heat profile to be imparted to the preform by the infrared radiation and for the exact temperature profiling then to be performed only by the microwave. The inverse of this process is also conceivable, however, i.e., such that a basic temperature profile is imparted only by means of the microwaves, such that a more precise temperature profiling can then be produced in the preform by means of infrared radiation. It is also conceivable in this case, however, for infrared radiators to be additionally mounted in a microwave oven, such that the two heating methods can be combined with one another in any sequence, in any zones and in any intensity.

Problems solved by technology

In most cases, it is not desirable for the upper part of the preform, i.e. the opening region, to be heated as well, since this region is not intended ultimately to be reshaped.

Method used

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  • Heating device for plastic blanks
  • Heating device for plastic blanks
  • Heating device for plastic blanks

Examples

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Embodiment Construction

[0059]FIG. 1 shows a circular heating device for preforms 1, the latter being moved on a circular path, according to the circumference of the heating device, in the course of the heating operation. The heating device has a carrier 4, which, in this case, simultaneously constitutes a rectangular hollow conductor. Fastened to this carrier 4 are various structural units, for instance eight microwave compact heads 20 and forty microwave heating units 3. These units, fastened to the carrier 4, revolve jointly about the machine axis 5. The transfer from an upstream unit to the oven 40 is effected by means of a star, such as, for example, a sawtooth star or a clip star.

[0060]FIG. 2 shows a portion of the oven 40 according to FIG. 1, the microwave heating unit 3 being better explained here. Seen here, likewise, are the microwave compact heads 20, which generate the microwaves and which are directly connected to the carrier 4, which, in this case, constitutes a hollow conductor 22. Mounted i...

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Abstract

The invention relates to a method and a device for heating preforms of a thermoplastic material, the preforms, after having been heated, being subjected to a reshaping operation, and microwaves being applied to the preforms, at least during a portion of the period of heating, in a resonator.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is filed under 35 U.S.C. 371 as a U.S. national phase application of PCT / EP2007 / 004154, having an international filing date of May 10, 2007, which claims the benefit of DE 10 2006 022 207.5 having a filing date of Mar. 11, 2006, the contents of which are hereby incorporated by reference in their entirety.TECHNICAL FIELD[0002]The disclosure relates generally to methods and devices for heating preforms and an arrangement for producing containers that include these methods and devices. More particularly, the disclosure relates to methods and devices for heating preforms via microwaves and an arrangement for producing containers including the same.BACKGROUND[0003]Frequently, in the production of plastic hollow bodies, a method is used in which preforms are first heated, and then shaped. A particular domain of application of this technique is, for example, the production of foodstuffs containers, in particular plastic bottles, ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B29B13/08
CPCB29B13/024H05B6/80B29C49/6418B29C49/68B29C49/12B29C49/36B29C49/4205B29C49/6436B29C49/6445B29C49/6454B29C2035/0855B29K2023/00B29K2023/086B29K2027/06B29K2033/20B29K2067/00B29K2069/00B29K2077/00B29C49/06B29C49/786B29C2949/0715
Inventor HUMELE, HEINZDETROIS, CHRISTIANFORSTHOEVEL, JOCHENSCHLOEGL, MARTINZIMMERER, JOHANN
Owner KRONES AG
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